The bottom side of the line plate shall be cleaned up (no oil stains), and all the screw holes on the plate shall be tapped with screw taps.
线条板底侧面清洁干净(不能有油污)，板上螺丝孔全部用丝攻攻牙一次。
This is made from a part which is machined up on the lathe and tapped for screwing into the valve-plate, and a short section of steel tubing.
这是由一个是加工上的车床和到阀板拧挖掘的一部分，以及钢管短节。
This is made from a part which is machined up on the lathe and tapped for screwing into the valve-plate, and a short section of steel tubing.
这是由一个是加工上的车床和到阀板拧挖掘的一部分，以及钢管短节。
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